#main_menu,
#main_menu ul {
    list-style: none;
}
#main_menu {
    float: left;
}
 
#main_menu > li {
    float: left;
	background-color:#55bc0a;
}
 
 
#main_menu li a {
    display: block;
    height: 2em;
    line-height: 2em;
    padding:10px;
    text-decoration:none;
	color:#000;
	font-weight:bold;
}
 
#main_menu li a:hover {
	background-color:#333;
	color:#FFF;
}
 
#main_menu ul {
    position: absolute;
    display: none;
    z-index: 999;
}
#main_menu ul li a {
 
	background-color:#E2E2E2;
}
#main_menu li:hover ul {
    display: block;
}